Faceting Design Diagram: Thorn – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

Thorn (MC52.JRG)
By Jeff R. Graham
Copyright 2000
91.2% Light Return
Angles for R.I. = 1.54
17 facets + 6 facets on girdle = 23
2-fold, mirror-image symmetry
96 index L/W = 1.246 T/W = 0.840
T/L = 0.674 P/W = 0.383 C/W = 0.130
H/W = (P+C)/W+0.02 = 0.532
P/H = 0.719 C/H = 0.243
Vol./W^3 = 0.179

Addition # 7 – Basically cut this like a square, then cut the P3(G) to get the L/W… This is easy and fast. I like it in about any material, it works well in dark colors. Cut in refractive indexes 1.54 to 1.93 with no changes. This design makes nice earrings…


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.